[maplab-users] query and overlay, is possible this?

Zak James zak-ms at hoppsan.org
Mon Aug 23 10:22:48 EDT 2004


Doing that directly would require mapserver to be capable of geometric 
analysis and it does not include this functionality. The closest you 
could get would be to use a desktop GIS package to make a new layer 
from the intersections and include areas as attributes. Then you could 
use that layer with mapserver and get the query function (in your 
gmapfactory application, for instance)  to return overlay percentages 
with a little extra code.

PostGIS could be used with mapserver to do this in a more automated 
way, but that discussion is beyond the scope of this list.

Zak James
Applications and Software Development
DM Solutions Group Inc.

On Aug 17, 2004, at 11:51 AM, Alberto Cavalli wrote:

> Hi to all,
> I'm looking for the possibility to implement my project with some 
> specific
> gis utility but I don't know if my idea is really possible to realized.
> I've a question: I've two layers of different parcels and I'd like to 
> make a
> query. If I "click" in one point where I have two parcels that are 
> partially
> overlay is possible to see the  result (%) of overlay?   Did someone 
> make
> it?
> tanks in advance
> alberto
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